func (d *driver) VolumeAttach(
ctx types.Context,
volumeID string,
opts *types.VolumeAttachOpts) (*types.Volume, string, error) {
var modVol *types.Volume
for _, vol := range d.volumes {
if vol.ID == volumeID {
modVol = vol
break
}
}
modVol.Attachments = []*types.VolumeAttachment{
&types.VolumeAttachment{
DeviceName: *opts.NextDevice,
MountPoint: "",
InstanceID: context.MustInstanceID(ctx),
Status: "attached",
VolumeID: modVol.ID,
},
}
return modVol, "1234", nil
}
func (d *driver) VolumeDetach(
ctx types.Context,
volumeID string,
opts *types.VolumeDetachOpts) (*types.Volume, error) {
var modVol *types.Volume
for _, vol := range d.volumes {
if vol.ID == volumeID {
modVol = vol
break
}
}
modVol.Attachments = nil
return modVol, nil
}
func handleVolAttachments(
ctx types.Context,
lf log.Fields,
iid *types.InstanceID,
vol *types.Volume,
attachments types.VolumeAttachmentsTypes) bool {
if attachments == 0 {
vol.Attachments = nil
return true
}
if lf == nil {
lf = log.Fields{}
}
f := func(s types.VolumeAttachmentStates) bool {
lf["attachmentState"] = s
// if the volume has no attachments and the mask indicates that
// only attached volumes should be returned then omit this volume
if s == types.VolumeAvailable &&
attachments.Attached() &&
!attachments.Unattached() {
ctx.WithFields(lf).Debug("omitting unattached volume")
return false
}
// if the volume has attachments and the mask indicates that
// only unattached volumes should be returned then omit this volume
if (s == types.VolumeAttached || s == types.VolumeUnavailable) &&
!attachments.Attached() &&
attachments.Unattached() {
ctx.WithFields(lf).Debug("omitting attached volume")
return false
}
ctx.WithFields(lf).Debug("including volume")
return true
}
// if the attachment state has already been set by the driver then
// use it to determine whether the volume should be omitted
if vol.AttachmentState > 0 {
ctx.WithFields(lf).Debug(
"deferring to driver-specified attachment state")
return f(vol.AttachmentState)
}
ctx.WithFields(lf).Debug("manually calculating attachment state")
// if only the requesting instance's attachments are requested then
// filter the volume's attachments list
if attachments.Mine() {
atts := []*types.VolumeAttachment{}
for _, a := range vol.Attachments {
alf := log.Fields{
"attDeviceName": a.DeviceName,
"attDountPoint": a.MountPoint,
"attVolumeID": a.VolumeID,
}
if strings.EqualFold(iid.ID, a.InstanceID.ID) {
atts = append(atts, a)
ctx.WithFields(lf).WithFields(alf).Debug(
"including volume attachment")
} else {
ctx.WithFields(lf).WithFields(alf).Debug(
"omitting volume attachment")
}
}
vol.Attachments = atts
ctx.WithFields(lf).Debug("included volume attached to instance")
}
// determine a volume's attachment state
if len(vol.Attachments) == 0 {
vol.AttachmentState = types.VolumeAvailable
} else {
vol.AttachmentState = types.VolumeUnavailable
if iid != nil {
for _, a := range vol.Attachments {
if a.InstanceID != nil &&
strings.EqualFold(iid.ID, a.InstanceID.ID) {
vol.AttachmentState = types.VolumeAttached
break
}
}
}
}
// use the ascertained attachment state to determine whether or not the
// volume should be omitted
return f(vol.AttachmentState)
}